Bump @rails/webpacker from 5.2.1 to 5.4.0

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Bumps @rails/webpacker from 5.2.1 to 5.4.0.

Changelog

Sourced from @​rails/webpacker's changelog.

[5.4.0] - 2021-05-18

• Fix compatibility with Psych 4

[5.3.0] - 2021-04-27

• Adds experimental Yarn 2 support. Note you must manually set nodeLinker: node-modules in your .yarnrc.yml.

• Keep backups, even when they're old #2912

[5.2.2] - 2021-04-27

• Bump deps and remove node-sass #2997.

Commits

• 272762d 5.4.0
• 7c6e1c2 Minor deps bump
• ceaf826 Fix compatibility with Psych 4
• 34c02ff 5.3.0
• eedd2ab Keep backups, even when they're old. (#2734) (#2912)
• 745837a 5.2.2
• 21e2e6a Bump deps and remove node-sass (#2997)
• 6fbacc8 Merge pull request #2903 from pedrofurtado/5-x-stable
• 27a42bf Update ruby.yml
• b46ce72 Update file.js (#2902)
• Additional commits viewable in compare view

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[gitpod-io]

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[jywarren]

Hi @noi5e - no worries if you're busy, but if you had a suggestion as to how best to manually test webpack compilation, i wanted to do that in GitPod before merging this. Or is there a test that already does so? Thank you!!

[jywarren]

Aha, never mind! Looks like rake assets:precompile does it, and it worked fine.

I did still see that warning:

WARNING in ./app/javascript/components/REACT_COMMENTS.md 1:0
Module parse failed: Unexpected character '#' (1:0)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
> # `React Commenting System`
| 
| **Last Updated: 3/13/2021**
 @ ./app/javascript/components sync ^\.\/.*$ ./REACT_COMMENTS.md
 @ ./app/javascript/packs/server_rendering.js

but the site itself looked fine. Merging!